Alarm.



G. YOCH.

ALARM.

APPLICATION FILED MABHZS, 1912.

Patented Aug. 13, 1912.

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PATENT OFFICE.

GEORGE YOGI-I, OF FREELAND, PENNSYLVANIA.

ALARM.

Specification of Letters Patent.

Application filed March 23, 1912.

Patented Aug. 13, 1912.

Serial No. 685,769.

To all whom it may concern Be it known that I, Gnonen Yocn, a citizen ofthe United States, residing at Freeland, in the county of Luzerne andState of Pennsylvania, have invented certain new and useful Improvementsin Alarms, of which the following is a specification, reference beingbad to the accompanying drawings.

This invention comprehends certain new and useful improvements insignals and relates particularly to a knob actuated alarm.

The invention has for its primary object a simple, durable and etlieientconstruction of audible signal which may be easily attached to the knobof a door whereby the occupant or occupants of the room into which thedoor leads may be instantly apprised of the fact when the knob is turnedpreparatory to opening the door.

The invention has for a further object an improved construction of knobactuated. alarm the parts of which may be easily and cheaplyconstruct-ed and capable of being readily assembled and not liable toget out of order. a

A still further object of the invention is to provide a device of thistype which includes a knob engaging element capable of fitting and beingsecured to knobs of clifferent sizes, so as to increase the range ofusefulness of the device, the parts being so arranged that the devicemay be very quickly attached to a knob when required and very easilyremoved when not desired for use. And the invention also aims togenerally improve this class of devices to render them more useful andcommercially desirable.

With these and other objects in view as will more fully appear as thedescription proceeds, the invention consists in certain constructions,arrangements and combinations of the parts that I shall hereinafterfully describe and claim.

For a full understanding of the invention reference is to be had to thefollowing description and accompanying drawings, in which Figure 1 is aside edge view of my improved alarm, showing its application to a doorknob, the latter being indicated in dotted lines; Fig. 2 is a face viewof the device, a part being broken away; Fig. 3 is a horizontalsectional View, the section being taken on a plane indicated by the line3----3 of Fig. 1 Fig. 4: is a detail perspective view of the knobengaging elements of the device; and Fig. 5 is a fragmentary perspectiveview of the post which is designed for cngagen'ient thereby.

Correspmiding and like parts are referred to in the following(lQSUI'iPtiOIl and indicated in all the views of the accompanyingdrawings by like reference characters. Referring to the drawings, thenumeral 1 designates the base plate of my improved knob actuated alarm,said base plate being provided within its upper end with an opening 2 inwhich a post 8 is journaled, said post being also journaled in a casing4; which, in the present embodiment of the invention, is open at top andbottom and which is formed by a metallic strap with angular ends havingtaugs 5 clenched in perforations 6 formed in the base plate. Secured tothe post 3 and mounted within the casing i is a master gear wheel 7 theteeth of which mesh with a spur pinion S secured to a shaft 9 journaledin the base plate below the post The pinion S is mounted in a casing 10which corresponds in formation, but is preferably smaller than thecasing l, hereinbefore mentioned.

The pinion 8 is formed on one face with diametrically disposed pins 11which are received in a substantially triangular opeI1- ing 12 formed inthe enlarged upper end of a link 13 which is also mounted in the casing10, between the wall thereof and the outermost face of the pinion. Atthis point it will be understood that when the post 3 is turned thepinion 8 will be rotated in a direction to cause one of the pins 11 toengage with the wall of the opening 12 and thus raise the link 13.

The link 13 is pivotally connected at its lower end, as at 141 with adetent or pawl 15 which is pivoted on a stud 15 projecting from one faceof the base plate 1 and which is formed with a hooked free end designedfor engagement with a cog wheel 16 which is secured to a shaft 17 drivenby a spring motor 18 secured to the opposite face of the base plate 1,as clearly illustrated in the drawings. The spring 19 of said motor maybe easily wound by a key or handle 20, as shown. In addition to the cogwheel 16, the shaft 17 carries a freely pivoted and preferably joinedstriker 21 which is de signed to engage a gong 22 held on a post whichis secured to the base plate 1. The

detent 15 is normally held in engagement with the cog wheel 16 by acontractile spring 23.

From as much of the description as has preceded, in connection with theaccompanying drawings, it will be understood that when the post 3is'turned as before mentioned and the pinion 8 also turned thereby, oneof the pins 11 will cause the link to be raised upwardly so as torelease the detent 15 from the cog wheel 16, thereby permitting themotor to act to sound the alarm by the repeated engagement of thestriker 21 with the gong 22. As soon as the post is released or turnedback to its initial inoperative position where the two pins 11 will lieagainst the upper wall of the opening 12, it is clear that the spring 23will be permitted to act to cause the engagement of the pawl 15 with thecog wheel 16 and consequently the device will be held in an inoperativecondition.

As stated in the outset of the specification, it is one of the objectsof my invention to provide a device of this character which may beconveniently used as an attachment for use in connection with anyordinary knob for a door. To accomplish this result, the post 3, in thepresent embodiment of the invention is formed at opposite sides withnotches 24 designed for engagement with flanges 25 that are formed on aclip 26 which is designed for engagement with a door knob, beingprovided for this purpose with laterally extending curved ears 27designed to engage over the knob. Thus it will be understood that whenthe clip 26 is engaged with the post, any turning of the clip will causethe post to turn also. The clip 26 is provided at one end with aflexible strap 28 carrying a hook 29, whereby a rubber band 30 or othercontractile band may be engaged around said hook and also around thehooks 31 that are formed on the pins 27 so as to detachably and yetsecurely hold the clip upon the knob.

It will thus be seen that the device may be easily secured to a doorknob on the inside of a room, so that when the latch is opened from theoutside and the knob is turned, the post 8 will be also turned and thealarm sounded, in the manner hereinbefore set forth.

- pawl.

While the accompanying drawings illustrate what I believe to be thepreferred embodiment of my invention, it is to be understood that theinvention is not limited thereto but that various changes may be made inthe construction, arrangement and proportions of the parts withoutdeparting from the scope of the invent-ion as defined in the appendedclaims.

Havin thus described the invention what is claimed is:

1. An alarm of the character described, including a base plate, a postjournaled therein and adapted to be turned, a master gear wheel carriedby said post, a pinion meshing with said gear wheel and formed on oneface with pins, a link formed with an opening accommodating said pins,the

pins being adapted to engage the wall of said opening to move the link,a pawl pivotally supported upon the base plate and connected to saidlink, an audible signal including a gong and a striker therefor, aspring motor arranged to operate the striker, and a cog wheel movablewith the striker and designed for engagement by said 2. An alarm of thecharacter described, including a base plate, a post journaled therein, amaster gear wheel carried by said post, a casing secured to one face ofthe base plate and in which the post is journaled and the gear wheelmounted, another casing se cured to the base plate below the first namedcasing, a pinion mounted in said second named casing and formed on oneface with diametrically opposed pins, a link mounted in said secondnamed casing and formed at one end with an opening receiving said pins,a pawl pivotally connected to the base plate and operatively connectedto the lower end of said link, a gong carried by the base plate, aspring motor, a striker adapted for engagement with the gong andactuated by said motor, and acog wheel movable with said striker anddesigned for engagement by said pawl.

In testimony whereof I hereunto aflix my signature in the presence oftwo witnesses.

GEORGE YOCH. Witnesses:

DANIEL S. BUCKLEY, VICTOR A OswALn.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

